Euclase
A variety of Minerals
What is Euclase?
Rich deposits of this rare gem were first found in Russia's Ural mountains, but smaller caches of euclase have been sporadically found in other places across the globe. In those smaller finds, specimens are often overlooked and misidentified as less-desirable minerals. Euclase is quite soft and therefore not prime for use in jewelry.
Etymology & Origins
Euclase crystals are noted for their blue color, ranging from very pale to dark blue. The mineral may also be colorless, white, or light green. Cleavage is perfect, parallel to the clinopinacoid, and this suggested to René Just Haüy the name euclase, from the Greek εὖ, easily, and κλάσις, fracture.
Uses & Applications
Euclase has no important industrial uses but is sometimes sought after for mineral collections and to cut into gemstones. Its vivid colors and clarity make euclase a beautiful gemstone, but its rarity prevents it from gaining popularity.
Optical Properties
- Refractive Index
- 1.650-1.677
- Birefringence
- 0.019-0.025
- Pleochroism
- Weak: colorless to greenish, yellow-green, blue-green
- Optical Character
- Biaxial positive
- Dispersion
- 0.016
Euclase Market Value Calculator
Estimate the market value of Euclase using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.
Euclase Localities Map
See where Euclase is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Colorless, white, pale green to deep yellowish green, greenish blue, pale blue to deep blue
- Hardness (Mohs)
- 7.5
- Density
- 3.115 g/cm³
- Streak
- White
- Luster
- Vitreous
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- BeAl(SiO4)(OH)
- Elements
- Al, Be, H, O, Si
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